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Indexed by:期刊论文

Date of Publication:2011-11-15

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:Scopus、SCIE、EI

Volume:528

Issue:29-30

Page Number:8551-8556

ISSN No.:0921-5093

Key Words:Bulk metallic glasses; Zr-based alloys; Glass-forming ability; Mechanical properties; Corrosion resistance

Abstract:The thermal stability, glass-forming ability (GFA), mechanical properties and corrosion resistance of Zr60Cu25-xAl15Nix (x = 0-25 at.%) bulk metallic glasses (BMGs) were systematically investigated. The additional Ni greatly enhances the thermal stability and GFA of BMGs. For alloy with x = 15, a fully glassy rod with a critical diameter up to 18 mm can be obtained by copper mold casting. In addition, the strength and plasticity of BMGs are effectively improved by adding Ni, and they show remarkable correlations with glass transition temperature and Poisson's ratio or GIB value, respectively. A Zr60Cu5Al15Ni20 BMG exhibits largest compressive plastic strain of 5.5%, yielding strength of 1755 MPa and Young's modulus of 83 GPa at ambient temperature. Moreover, the electrochemical potentiodynamic polarization curves demonstrate that replacement of Cu by Ni improves the corrosion resistance in chloride-ion-containing solutions significantly. (C) 2011 Elsevier B.V. All rights reserved.